81718360

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{6569}}^1$

素因数の和:6891

約数の個数: 32

約数和(自身を含む): 184485600

約数和(自身を除く): 102767240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 2488, 3110, 6220, 6569, 12440, 13138, 26276, 32845, 52552, 65690, 131380, 262760, 2042959, 4085918, 8171836, 10214795, 16343672, 20429590, 40859180, 81718360]

約数ペア:

[(1, 81718360), (2, 40859180), (4, 20429590), (5, 16343672), (8, 10214795), (10, 8171836), (20, 4085918), (40, 2042959), (311, 262760), (622, 131380), (1244, 65690), (1555, 52552), (2488, 32845), (3110, 26276), (6220, 13138), (6569, 12440)]